Die for making chisels



(No Model) J. SWAN.

DIE FOR MAKING GHISELS.

No. 398,910. Patented Mar. 5, 1889.

UNITED STATES PATENT Urricn,

JAMES SVAN, OF SEYMOUR, CONNECTIL'TUT.

DIE FOR MAKING CHISELS.

SPECIFICATION forming part of Letters Patent No. 398,910, dated March 5,1889.

Application filed January 8, 1889. $erial No. 295,794, (No model.)

To all whomit may concern.-

Be it known that I, JAMES SWAN, a citizen of the United States, residingat Seymour, in the county of New Haven and State of Connecticut, haveinvented certain new and useful Improvements in Dies for MakingBeveled-Edge Chisels; and I do hereby declare the following to be afull, clear, and exact description of the inventiornsuch as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention has for its object to produce a set of dies that willperfectly form firmer chisels and other tools having beveled edges.

Heretofore, so far as I am aware, the bevcls upon tools of this classhave been made on tirely by grinding upon stones, which is a veryexpensive operation, wasting as it does considerable steel in each tool,wearing away the stones very rapidly, and requiring a large amount oftime and skilled labor. Attempts have heretofore been made to form thisclass of tools byswaging-in dies. These attempts, however, have neverbeen successful, for the reason that, so far as I am aware, but one diehas been used, and that not of proper shape. I have discovered, after acarefally-conducted series of experiments, that perfect tools of thisclass can be formed by the use of one or more short breakingdown diesand one or more longer drawing and finishing dies. In practice Iaccomplish perfectly satisfactory results by using a single shortbreaking-down die flaring at the ends and a single longer drawing andfinishing die, in addition to which I of course use the ordinarygage-die, all the dies in the series being formed in two blocks ofmetal.

It will of course be understood that the upper die is carried by apower-hammer and that the lower die is supported in any suit ablemanner. These features, having nothing whatever to do with my presentinvention,

down dies; Fig. 3, a section on the line y y in Fig. 1-that is, throughthe drawing and finishing dies; Fig. 4, a plan view of the lower dies;and Fig. 5, a view of an ordinary firmerchisel, showing the blade asformed by my novel dies.

1 denotes the lower block of metal in which the lower breaking-down die,2, and the lower finishing die or dies, 3, are formed, and l denotes theupper block, which constitutes the upper'ineniber of each pair of dies.

It will of course be understood that the special shape of the dies ismade to correspond with the chisel that it is desired to produce. Asthis class of chisels is usually made thickest at the handle end, andthe bevels of about the same width from end to end, it of course followsthat the front end of each lower die inust be more or less lower thanthe rear end,

depending. of course; upon the style of chisel it is desired to produce.The breaking-down dieor, more correctly, the lower member of the pair ofbreaking-down dies, which I have denoted by 2I form in practice from aninch and a quarter to an inch and a half long, making the die to flareconsiderably at both front and back, the curves reaching nearly to thecenter of the die. The portion of the upper block which acts inconnection with this die, which is, strictly speaking, the upper brealcing-down die, and which I will designaie by 5, I preferably curveslightly from front to back, as is clearly shown in Figs. 1 and 2. Thedrawing and finishin dies are made practically the same size and shapein cross section the breaking-down dies. If any difference at all ispermitted, the drawing and finishing dies should be slightly smaller, sothat the chisels will be turned up perfectly. These dies l lllflliOapproximately double ihc length. of the breaking-down dies, bevclingthcin slightly at the ends. it should be understood, however, that myinvention not liiniicd to any special length of either The breaking-downor the drawing and finishing dies, this being a matter that may be leftwith safety to the judgment of the manufacturer after the principle ofmy invention has been explained, the gist of my invention lying in thediscovery that by the use of relatively short breaking-down dies,followed by the use of relatively long drawing and finishing dies,

it is made practicable to form tools of this class in dies, therebyproducing very much better tools at a greatly-reduced cost, as theoperation of grinding down the bevels is wholly dispensed with. It is ofcourse not essential that the entire grooves of the dies should be ineither block. Both blocks may be grooved, if preferred, one of thegrooves being of slight depth.

6 denotes the gage-dies, which are formed in the upper and lower blocks,as clearly shown in Fig. 1.. After each operation the chisel is passedthrough the gage-dies, so as to keep the edges straight and to keep thechisel the exact width required.

Having thus described my invention, 1 claim- Y 1. A set of dies formaking beveled-edge tools, consisting of a relatively short break ingdoWn die of the required shape Whose ends member being fiat upon itsunder side.

In testimony whereof I affix my signature in presence of two Witnesses.

JAMES SWAN. \Vitnesses:

A. M. WoosrER, 07 M. NEWMAN.

